Model: 55LH6521-070

Double Hexagon Self-locking Nut

Properties:

Thread Class

Thread Direction

Right-hand

Locking Feature

Prevailing torque all metal design

Lubrication

Soluble lubricant

Nut Style

Double hexagon

Nut Height

0.372 inches

Width Across Flats

Between 0.679 inches and 0.690 inches

Tempurature Rating

Between -65.0 degrees fahrenheit and 450.0 degrees fahrenheit

Thread Series

Unjf

Thready Qty Per Inch (tpi)

Hardness Rating

Between 38.0 rockwell c and 45.0 rockwell c

Thread Size

0.438 inches

Bearing Surface Type

Chamfered

Bearing Surface Finish

125.0 microinches

Material

Steel comp 8740 or steel comp 8630 or steel comp 4037 or steel comp h11

Material Specification

Ams 6322 assn standard 1st material response or ams 6280 assn standard 2nd material response or ams 6300 assn standard 3rd material response or ams 6304 assn standard 4th material response

Surface Treatment

Cadmium

Surface Treatment Specification

Qq-p-416, type 2, cl 2 federal specification single treatment response

NSN

5310-00-255-5008

Part Number

55LH6521-070

Description

Nut,self-locking,double Hexagon

CAGE

72962

A nut having 12 drive points and 24 sides. The bearing surface may be washer faced. An integral locking feature is incorporated in the design of the head or in the threads.

Part 55LH6521-070 NSN 5310-00-255-5008

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

05276

FIIG:

A021A0

Concept No.:

App. Key:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

0.1000lbs

Item Weight:

Item Dim:

OPI

SPI No.

SPI Rev.

SPC Mkg.

LVL A

LVL B

OPI:

SPI No.:

SPI Rev.:

SPC Mkg:

LVL_A:

LVL_B:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

093486

UFC:

48950

LTL:

RATING VARIABLE

LCL:

WCC:

573

TCC:

SHC:

ACC:

Construction Materials

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Schedule B and Export

Schedule B: 7318160000
SITC: 69421
End Use: Finished metal shapes
NAICS: 332722
USDA: 1

Freight Class: Nuts of iron or steel